Add doc for freeradius::module::ippool

       * [`freeradius::module::ldap`](#freeradiusmoduleldap)

       * [`freeradius::krb5`](#freeradiuskrb5)

       * [`freeradius::module`](#freeradiusmodule)

       * [`freeradius::module::ippool`](#freeradiusmoduleippool)

       * [`freeradius::policy`](#freeradiuspolicy)

       * [`freeradius::realm`](#freeradiusrealm)

       * [`freeradius::site`](#freeradiussite)

}

```

#### `freeradius::module::ippool`

Install a `ippool` module

##### `ensure`

If the module should `present` or `absent`. Default: `present`.

##### `range_start`

The first IP address of the pool.

##### `range_stop`

The last IP address of the pool.

##### `netmask`

The network mask used for the pool

##### `cache_size`

The gdbm cache size for the db files. Default: number of IP address in the range.

##### `filename`

The main db file used to allocate address. Default: `${db_dir}/db.${name}`

##### `ip_index`

Helper db index file. Default: `${db_dir}/db.${name}.index`

##### `override`

If set, the Framed-IP-Address already in the reply (if any) will be discarded. Default: `no`.

##### `maximum_timeout`

Maximum time in seconds that an entry may be active. Default: `0` (no timeout).

##### `key`

The key to use for the session database. Default: `undef`.

#### `freeradius::policy`

Install a policy from a flat file.